Flowserve LNGT - Manual (Page 33)

LNGT USER INSTRUCTIONS ENGLISH 00083107 02-08
Page 33 of 48
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6.8.7 Disassembly of the throwers and V-
rings (Labyrinth rings)
This procedure describes how to remove the
throwers and V-rings (Labyrinth rings) from the
pump shaft.
ƒ Loosen the set screws [6570] from the thrower
[6570] until the set screw is free from the pump
shaft.
ƒ Remove the throwers [2540] from the pump
shaft.
ƒ Remove the V-ring (Labyrinth ring) (Labyrinth
ring) [4330] from the pump shaft. The V-ring
(Labyrinth ring) (Labyrinth ring) should be
disposed off correctly. During assembly, the old
ring should be replaced by a new one.
6.8.8 Disassembly of the mechanical seal
This procedure describes how to remove the
mechanical seal.
ƒ Remove the circlip from the mechanical seal in
accordance with the supplier's instructions,
until the mechanical seal is released from the
pump shaft.
ƒ Slide the mechanical seal [4200] from the
pump shaft.
6.8.9 Disassembly of the sleeves
This procedure describes how to remove the
sleeves from the pump shaft.
ƒ Loosen the set screw [6570] from the sleeves
until they are free from the pump shaft.
ƒ Slide the sleeves [2445] from the pump shaft.
6.8.10 Disassembly of the impeller
This procedure describes how to remove the
impeller from the pump shaft.
ƒ Remove the O-rings [4610]. These O-rings
ensure that the retaining rings do not move in
relation to each other.
ƒ Remove the retaining rings [2531].
ƒ Slide the impeller [2200] from the pump shaft
and remove key [6700] which is now
accessible.
6.8.11 Disassembly of the impeller wearing
ring[s], if present
During assembly, the impeller wearing rings [2300]
were shrunk or pressed onto the impeller. Use an
appropriate puller tool to remove the impeller
wearing ring[s].
ƒ Remove the set screw [6570] which are used to
secure the impeller wearing ring to the impeller.
ƒ Remove the impeller wearing ring from the
impeller using the puller tool.
6.9 Assembly
To assemble the pump consult the sectional
drawings, see section 8, Parts list and drawings.
Ensure threads, gasket and O-ring mating faces
are clean and that ball bearings are C3 fit. Apply
thread sealant to non-face sealing pipe thread
fittings.
Inspect the internal pump parts for:
- breakage/cracks;
- corrosion;
- wear;
- clogging;
- other
irregularities.
Clean all parts thoroughly prior to assembly.
Replace all parts which are worn or damaged.
Always apply assembly paste to surfaces which
could damage one another during assembly.
6.9.1 Assembly of the impeller wearing
ring[s], if present
This procedure describes how to assemble the
impeller wearing rings on both sides of the impeller.
ƒ Clean the assembly surfaces of the impeller
wearing ring [2300] and the impeller [2200].
ƒ Use the appropriate personal protection
equipment and clothing while heating and
assembling the impeller wearing ring.
ƒ Heat the impeller wearing ring to
a temperature of 120° to 150°C. Be careful
during assembly of chromium-sprayed impeller
wearing rings. Quick heating or cooling down
could loosen the sprayed-on chromium layer.
ƒ Slide the impeller wearing ring straight over the
impeller and allow the assembly to cool down.
ƒ Drill three holes, each spaced at 120°, local to
the transition between the impeller wearing ring
and the impeller. Make sure that the holes are
so deep, that the set screws [6570] do not
protrude from the face of the impeller wearing
ring and the impeller.
ƒ Tap screw thread into the three holes and
remove any residual metal.
ƒ Fit the set screws.
ƒ Secure the set screw using a center punch.